Effects of hardware geometry of dual-stage swirl cup on ignition performance

A research has been done to study the influence on the ignition performance by the hardware geometry (venturi and sleeve) of swirl cup (case A and B). A Particle Image Velocimetry (PIV) was employed to measure the flow fields of the different combustor dome. Fuel spray fields and SMD also have been measured. Results of experiments show that the hardware geometry of venturi and sleeve has a great influence on the flow fields, spray distributions and SMD of the dome, leading to a big difference of ignition performance of the combustor between the two cases. Compared with case B, case A has a smaller recirculation zone of the combustor dome, and the angles of the swirl flows and sprays which are from the swirl cup also become smaller, but has a larger SMD. Consequently, the ignition performance of case B has improved significantly than case A.